In the central networking mode of the converged conference MCU, what is correct about the traversal of public and private networks? () (Multiple selected)

In the central networking mode of the converged conference MCU, what is correct about the traversal of public and private networks? () (Multiple selected)
A . TE/RP/TP access MCU through SC proxy signaling and media stream
B . eSpace Mobile accesses MCU C through SBC proxy audio and video media.
C . External web client access MCU through MS proxy audio and video
D . eSpace PC connects to MCU through SC proxy signaling and media stream

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Answer: A,B,C